def main():
	n, m = map(int, input().split())
	ans = 0
	for _ in range(n):
		s, r = input().split()
		s = list(s)
		r = int(r)
		f = 0
		for i in range(4):
			f |= r >= 1200 and s[i] == "x"
		ans += f
	print(ans)

if __name__ == "__main__":
	main()